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We define a subcategory of the category of diffeological spaces, which contains smooth manifolds, the diffeomorphism subgroups and its coadjoint orbits. In these spaces we construct a tangent bundle, vector fields and a de Rham cohomology.

Differential Geometry · Mathematics 2007-05-23 Carlos A. Torre

We produce an example of a rigid, but not infinitesimally rigid smooth compact complex surface with ample canonical bundle using results about arrangements of lines inspired by work of Hirzebruch, Kapovich and Millson, Manetti and Vakil.

Algebraic Geometry · Mathematics 2021-06-02 Christian Böhning , Hans-Christian Graf von Bothmer , Roberto Pignatelli

Motivated by the holographic prescriptions for computing entanglement entropy and complexity, we study the properties of volumes/areas of bulk surfaces. We obtain a simple formula for the shape dependence of holographic entanglement entropy…

High Energy Physics - Theory · Physics 2017-10-02 Dean Carmi

We define contact fiber bundles and investigate conditions for the existence of contact structures on the total space of such a bundle. The results are analogous to minimal coupling in symplectic geometry. The two applications are…

Differential Geometry · Mathematics 2009-11-10 Eugene Lerman

This is an exposition of the inverse spectral theory of canonical systems based on de Branges spaces of entire functions

Spectral Theory · Mathematics 2014-08-27 Roman Romanov

We endow the cohomology of configuration spaces of a manifold with a product arising from superposing configurations. We prove that, under the scanning isomorphism, this product corresponds to the cup-product of the section space of the…

Algebraic Topology · Mathematics 2024-04-26 Andreas Stavrou

We present a two-part program for state space decomposition. States are classified into entanglement classes based on local unitary transformations, and then characterized as elements of topological spaces using the language of fibre…

Quantum Physics · Physics 2007-05-23 Scott N. Walck

Complex band structure generalizes conventional band structure by also considering wavevectors with complex components. In this way, complex band structure describes both the bulk-propagating states from conventional band structure and the…

Materials Science · Physics 2017-07-20 Matthew G. Reuter

We investigate the relation between Cartan decompositions of the unitary group and discrete quantum symmetries. To every Cartan decomposition there corresponds a quantum symmetry which is the identity when applied twice. As an application,…

Quantum Physics · Physics 2007-05-23 Domenico D'Alessandro , Francesca Albertini

Let $h$ be a without fixed point lift to the plane of a homeomorphism of the open annulus isotopic to the identity and without wandering point. We show that $h$ admits a $h$-invariant dense open set $O$ on which it is conjugate to a…

Dynamical Systems · Mathematics 2009-06-03 Lucien Guillou

In this article we prove the existence of a canonical theta structure for the canonical lift of an ordinary abelian variety.

Number Theory · Mathematics 2007-05-23 Robert Carls

The paper describes a cover of the future cover of a sofic shift which is canonical in the same way as the future cover itself. In some cases the cover is isomorphic to the future cover and in other it is a genuine extension.

Dynamical Systems · Mathematics 2026-04-29 Klaus Thomsen

We study contact resolutions of Jacobi structures which are contact on an open subset. We give several classes of examples, as well as classes for which it cannot exist.

Differential Geometry · Mathematics 2023-06-13 Hichem Lassoued , Camille Laurent-Gengoux

We show that on any closed contact manifold of dimension greater than 1 a contact structure with vanishing contact homology can be constructed. The basic idea for the construction comes from Giroux. We use a special open book decomposition…

Symplectic Geometry · Mathematics 2018-11-08 Frederic Bourgeois , Otto van Koert

A formal system called cologic is proposed for the study of compacta. A counterpart of countable model theory is developed for this system, and it is applied to model theory of the pseudo-arc.

Logic · Mathematics 2026-05-27 Kentarô Yamamoto

On the basis of the covariant description of the canonical formalism for quantization, we present the basic elements of the symplectic geometry for a restricted class of topological defects propagating on a curved background spacetime. We…

High Energy Physics - Theory · Physics 2009-11-07 R. Cartas-Fuentevilla

We describe a technique for structured prediction, based on canonical correlation analysis. Our learning algorithm finds two projections for the input and the output spaces that aim at projecting a given input and its correct output into…

Computation and Language · Computer Science 2017-11-21 Nikos Papasarantopoulos , Helen Jiang , Shay B. Cohen

We study neighborhoods of configurations of symplectic surfaces in symplectic 4-manifolds. We show that suitably `positive' configurations have neighborhoods with concave boundaries and we explicitly describe open book decompositions of the…

Geometric Topology · Mathematics 2014-10-01 David T. Gay

In this paper we write explicitly the open book decompositions of links of quotient surface singularities supporting the corresponding unique Milnor fillable contact structure. The page-genus of these Milnor open books are minimal among all…

Geometric Topology · Mathematics 2012-04-17 Elif Dalyan

We introduce a category of noncommutative bundles. To establish geometry in this category we construct suitable noncommutative differential calculi on these bundles and study their basic properties. Furthermore we define the notion of a…

q-alg · Mathematics 2008-02-03 Markus J. Pflaum , Peter Schauenburg